Gc

__gc is an RCE vulnerability which existed from 200X-2009, any code that's ran on __gc has no security context implemented onto it allowing attackers to run code on the server level.

Tutorial

To patch __gc, follow these steps

• Open x32dbg
• Go to the symbols tab and open the RobloxPlayerBeta.exe (or RobloxApp.exe) module
• Right click on the disassembler and then Search for -> Current Module -> String References and search for__gc (there should be 12 results but they're all the same thing, just open the first one)
• If you see call roblox.675A20 double click it and you should land on a push ebp instruction with jne at the bottom
• Replace JNE with JMP
• Patch the file